<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox"  v-model="isAll">
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keyup.enter="enterFn"
      v-model="task"
    />
  </header>
</template>

<script>

export default {
  props: ['list'],
  data() {
    return {
      task: '',
    }
  },
  methods: {
    // 回车输入列表内容，子传父
    enterFn() {
      if (this.task.trim() === '') {
        alert('请输入再回车')
        return
      }
      this.$emit('enter', this.task)
      this.task = ''
    }
  },
  computed: {
    // 单选影响全选，全选影响单选
    isAll: {
      set(val) {
        this.list.forEach(item => item.isDone = val)
      },
      get() {
        return this.list.every(item => item.isDone)
      }
    }
  }
}
</script>